APA (7th ed.) Citation

Bahcall, J. N., & Ostriker, J. P. (1997). Unsolved problems in astrophysics. Princeton University Press.

Chicago Style (17th ed.) Citation

Bahcall, John N., and Jeremiah P. Ostriker. Unsolved Problems in Astrophysics. Princeton, NJ: Princeton University Press, 1997.

MLA (8th ed.) Citation

Bahcall, John N., and Jeremiah P. Ostriker. Unsolved Problems in Astrophysics. Princeton University Press, 1997.